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Role of Structural Morphology of Commodity Polymers in Microplastics and Nanoplastics Formation: Fragmentation, Effects and Associated Toxicity in the Aquatic Environment

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Reviews of Environmental Contamination and Toxicology Volume 259

Abstract

With the continued growth in plastic production, its ubiquitous use and insufficient waste management and disposal, the increased levels of plastics in the environment have led to growing ecological concerns. The breakdown of these plastic macromolecules to smaller micro and nanosized particles and their detection in the aerial, aquatic, marine and terrestrial environments has been reviewed extensively, especially for thermoplastics. However, the formation of micro and nanoplastics has typically been explained as a physical abrasion process, largely overlooking the underlying chemical structure-morphology correlations to the degradation mechanisms of the plastics. This is particularly true for the common commodity thermosets. This review focuses on the degradation pathways for the most widely produced commodity thermoplastics and thermosets into microplastics (MP)s and nanoplastics (NP)s, as well as their behaviour and associated toxicity. Special emphasis is placed on NPs, which are associated with greater risks for toxicity compared to MPs, due to their higher surface area to volume ratios. This review also assesses the current state of standardized detection and quantification methods as well as comprehensive regulations for these fragments in the aquatic environment.

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Abbreviations

Đ:

Dispersity

FTIR:

Fourier-Transform Infrared Spectroscopy

HDPE:

High density polyethylene

LDPE:

Low density polyethylene

MPs:

Microplastics

MW:

Molecular weight

NPs:

Nanoplastics

PAHs:

Polycyclic aromatic hydrocarbons

PBDE:

Polybrominated diphenyl ethers

PCBs:

Polychlorinated biphenyls

PCPs:

Personal care products

PE:

Polyethylene

PET:

Polyethylene terephthalate

PNEC:

Predicted no effect concentration

PP:

Polypropylene

PS:

Polystyrene

PU:

Polyurethane

PU-ET:

Polyether-based polyurethane

PVC:

Polyvinylchloride

SBR:

Styrene-butadiene rubber

TWP:

Tire and roadway particles

WWTPs:

Wastewater treatment plants

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Acknowledgments

The authors would like to acknowledge Dr. Chris Metcalfe for his generous assistance in providing thoughtful comments and reviewing the manuscript and Eric Wootton for his countless clarity revisions. The authors would also like to thank Ariel Weiss for providing the background art for the graphical abstract.

Authors’ Contributions

Cassandra Johannessen: Writing, editing, data curation, literature research, visualization, chemical structures/schemes/figures.

Dr. Shegufa Shetranjiwalla: Conceptualization, writing, editing, literature research, resources, supervision.

Conflicts of Interest/Competing Interests

The authors have no conflicts of interest to report.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Shegufa Shetranjiwalla .

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Johannessen, C., Shetranjiwalla, S. (2021). Role of Structural Morphology of Commodity Polymers in Microplastics and Nanoplastics Formation: Fragmentation, Effects and Associated Toxicity in the Aquatic Environment. In: de Voogt, P. (eds) Reviews of Environmental Contamination and Toxicology Volume 259. Reviews of Environmental Contamination and Toxicology, vol 259. Springer, Cham. https://doi.org/10.1007/398_2021_80

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